Three Friends

There are three friends; let's call them A, B, C. They made the following statements: - A: "I have $x$ Rupees more than B." - B: "I have $y$ rupees more than C." - C: "I have $z$ rupees more than A." You do not know the exact values of $x, y, z$. Instead, you are given their absolute values, i.e. $X = |x|$, $Y = |y|$ and $Z = |z|$. Note that $x$, $y$, $z$ may be negative; "having $-r$ rupees